A constant current I is maintained in a solenoid. Which of the following quantities will not increase if an iron rod is inserted in the solenoid along its axis?
  • Magnetic field at the centre.
  • Self-inductance of the solenoid.
  • Magnetic flux linked with the solenoid.
  • Rate of joule heating.
Whenever the magnetic flux () linked with a coil changes the emf is induced in the circuit, This emf lasts
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  • as long as the change in flux continues.
  • for a long time
  • for a short time
  • forever
The expression for the magnetic flux
Magnetic-Flux-Multiple-Choice-Questions-for-CBSE-Class-12-Physics-Topperlearning.png
  • A
  • B
  • C
  • D
A magnet is moved towards the coil (a) quickly and (b) slowly, and then the work done is
  • does not depend on the motion of the magnet.
  • smaller in case (a)
  • equal in both cases
  • larger in case (a)
A cylindrical bar magnet is held along the axis of a circular conducting loop. Which one of the following movements of the bar magnet will not induce a current in the loop?
  • The magnet is rotated about its own axis.
  • The magnet is moved along its length.
  • The magnet is rotated about an axis passing through its mid point and perpendicular to its length.
  • The magnet is rotated about an axis through one end and perpendicular to its length.
The magnetic flux () linked with a coil is related to the number (N) of turns of the coil as
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  • A
  • B
  • C
  • D
The total number of magnetic lines of force crossing a surface normally is termed as
  • Magnetic field.
  • Magnetic permeability.
  • Magnetic flux.
  • Magnetic susceptibility.
In the given circuit the maximum deflection in the galvanometer occurs when
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  • magnet is rotated inside the coil
  • magnet is stationary at the center of the coil.
  • numbers of turns in the coil is reduced.
  • magnet is pushed into the coil.
A coil of area 10 cm² of 20 turns is placed in uniform magnetic field of 104 gauss. The normal to the plane of the coil makes an angle of 60° with the magnetic field. The flux in maxwell through the coil is
  • 105
  • 106
  • 103
  • 104
The magnetic flux () linked with a coil is maximum, when the angle between the plane of the coil and the direction of the field is
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  • π/4
  • π/3
  • π/2
0 h : 0 m : 1 s

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